Architecture and Catalog Reference for SIMATIC PCS 7 Advanced Process Library (APL)

The SIMATIC PCS 7 Advanced Process Library (APL) is the standard automation control library delivered with PCS 7. It provides pre-engineered, standardized function blocks and companion WinCC faceplates categorized into distinct functional families: Drives and Actuators (MotL, MotRevL, MotSpdL, VlvL, Vlv2WayL, VlvAnL, VlvPosL), Continuous Controllers (PIDConL, PIDConR, PIDStepL), Monitoring (MonAnL, MonAnS, MonDiL, MonDiS), Interlocks (Intlk02, Intlk04, Intlk08, Intlk16), and Mathematical Operations (MeanTime, TotalL). All technical documentation, block operating principles, and I/O pin references are published in the official 'SIMATIC PCS 7 Advanced Process Library Manual' under Siemens Industry Online Support Entry ID 109482346.

APL Design Philosophy and Standard Features

The SIMATIC PCS 7 Advanced Process Library (APL) embodies decades of process industry operational experience, incorporating recommendations from NAMUR (NE107 diagnostics) and ISA standards. Every APL block incorporates unified operational characteristics:

Structured Signal Data Types: Analog and discrete values use structured variables containing both value and quality status (STRUCT: Value, ST: BYTE), eliminating manual error propagation logic.
Operating Modes: Unified mode switching between Manual, Automatic, Out of Service, and Local operating modes with configurable bumpless transfer.
Integrated Safety and Interlocks: Standardized permit (Permit), interlock without reset (Intlock), and protective interlock with reset (Protect) inputs across all drive and valve blocks.
OS Graphic Integration: Automated generation of WinCC block icons, standard faceplates, alarm views, and trend controls.

Comprehensive Overview of APL Block Families and Functions

The APL catalog is structured into key operational libraries:
1. Drives & Actuators: Control fixed-speed motors (MotL), reversing drives (MotRevL), two-speed motors (MotSpdL), discrete open/close valves (VlvL), multi-way diverters (Vlv2WayL), and modulating control valves (VlvAnL).
2. Continuous & Step Controllers: PIDConL delivers continuous regulation with feedforward disturbance compensation, gain scheduling, and anti-reset windup; PIDStepL controls integrating motor actuators without position feedback.
3. Process Monitoring: MonAnL provides multi-stage limit monitoring (High/Low Warning and Alarm) with gradient supervision; MonDiL monitors digital signals with integrated flutter suppression.
4. Interlock Logic: Intlk02 through Intlk16 evaluate logic conditions, latch first-in trips, and provide bypass management with full audit trail logging.

Catalog Reference Matrix for Standard APL Function Blocks

The table below catalogs standard APL blocks, block numbers, family classifications, and functional descriptions:

Block NameBlock NumberFamilyPrimary Functional DescriptionMotLFB1850DrivesControls single-speed motors with feedback monitoring and interlocking.VlvLFB1899DrivesControls discrete valves with open/closed limit switch evaluation.VlvAnLFB1896DrivesRegulates modulating control valves with continuous 0-100% positioners.PIDConLFB1874ControlContinuous PID controller with setpoint tracking and disturbance inputs.MonAnLFB1845MonitorAnalog monitoring with 4 limits, gradient checks, and deadband filtering.MonDiLFB1847MonitorDigital signal monitoring with flutter suppression and alarm delays.TotalLFB1906MathHigh-precision flow and volume totalizer with rollover handling.Intlk08FB1826Interlock8-input logic interlock with first-in detection and operator bypass.

Accessing APL Manuals and Documentation in SIMATIC Manager

Direct Context-Sensitive Help in CFC:
- In any CFC chart, select any APL block (e.g., PIDConL or MotL) and press F1.
- SIMATIC Manager opens the exact HTML Help reference for that block, displaying every parameter, status bit, and algorithm equation.
Accessing Installed PDF Manuals:
- On the Engineering Station, navigate to Start -> Siemens Automation -> Documentation -> Manuals -> English.
- Open SIMATIC PCS 7 - Advanced Process Library (APL).
Online Download from SIOS:
- Download the complete APL Function Manual directly via Siemens Industry Online Support (SIOS Entry ID 109482346 / 109760968).

Verification

Verify APL block utilization through the following checks:
1. In the CFC catalog pane, expand Libraries -> PCS 7 AP Library V90: confirm presence of standard folders (Control, Drives, Monitor).
2. Drag MotL onto a chart and compile: verify that Generate module drivers connects channel drivers and that OS compile creates the block icon in WinCC.
3. In WinCC Runtime, click the block icon: verify that the standard APL faceplate opens displaying operating mode, interlocks, and limits.

Limitations and Operational Precautions

Never mix blocks from the legacy PCS 7 Standard Library (DRIVER, CONTROL) with the Advanced Process Library (APL) on the same technological equipment. APL blocks utilize different status bit structures and faceplate communication protocols; mixing libraries results in broken faceplate popups and diagnostic inconsistencies. Always modernize legacy blocks to APL during major system upgrades.